Electric heater.



P. PHILPPGQ KEMP & W. H. GIBBONs ELECTRIC HEATER.

APPLIUATION FILED NOV.1', 1912.

Patented Dec. 23, 1913.

i W S EJWN a Inventor Beer manner-s COPY UNITED sTA-T'Es PATENT OFFICE;

'l'mx 2311.! Am) GEORGE KEMP, or rear ARTHUR, AND WILLIE n- (minors, or

. k Lennon, ONTARIO, CANADA.

ELECTRIC HEATER.

Patented Doc. 23, 1 913.

. Application lied November 1, 1912. Serial Io. 728,066.

To ail whom-it mag concern:

Be it known that we, FRANK PHIL! and Gamma Kent, both subjects of the Kin of,

Britain, and residents of Port Art ur 6 ifi theDistrict of Thunder Bay, -Province oi Ontario, in the Dominion of Canada, and Wrmm H.Gxmons, subject of the Kin of Great Britain, and resident of I on, *county ofMiddlese'x, Province of Ontario, in the Dominion of Canada'," respectively,

'. have-invented certain new and useful Im- .pmementain Electric Heaters, described 7 mettle-following specification and illustrated 'acoompanyingdrawings, that form pirtoithesame.

'.Theinvention essentially in the novel construction and arrangement of parts whereby the water, air or other fluid to be heated is circulated through a secondary Q .heeting'chamber in its passage to the priim shooting element.

MT e-obiect ofthe in vention is, to devise an eflicientand ecdnomlcal form of electric heaterof Simple and durable construction which may be eda ted for steam, water or mt helitingand w ich will not be liable to getoutof orden I v In the drawings, Figure 1 is a vertical sectional perspective view of a heater con- 80 structed in accordance with this invention. Fig. 2 is a cross sectional view through the line ab Fig. 1. Fig. 3 is an enlarged perspective view of a portion of one of the primary heating elements shown partly in lon- 85 gitudinal sections Like numerals of reference indicate corresponding parts in each figure. Referring to the drawings, 1 is a casing here shown of cylindrical form and having 0 the lateral. flanges 2 at the bottom and top thereof.

3 is a plate closing the bottom end of ,the casing 1 and secured by suitable rivets or bolts to the bottom flange 2,. said plate hav' g an opening 4.- therein in which a sui ble drain cock 5 is secured.

6 refopenings in the side wall of the casing 1%edjacent'to the top in which the intake pipl7= are inserted. Two of these pipes I? but one or more may be used as "desired.

8 is a head secured to the upper flange of the casing and preferably formed with a heavy circular central portion 9, said central portion having a central threaded hole 16 arranged in vertical ali'nemefnt with the orifices 11 in said head.

l7 are tubular members" extending through the casing 12 and having their open ends projecting through the orifices l1 19 are bushings of cork or other suitable material'arranged in the orificesll and 16 'anthsnrrounding the tubes 17 forming water tight parkin which will allow free expansion and contraction of the said tubes, The tubes 17 are formed with :1 rolled spiral thread terminating within the casing 12 and the exterior surface is covered with a suit-' able insulatingenamel coating.

20 arewircs of high resistance metal wound around the exterior of the tubes 17, said wires lying in the spiral grooves are held firmly in contact with said tubes and cannot be shifted or be displaced. The wires 20 in conjunction with the spiral tubes present a maximum heatmgsurface, the

heat radiating to the interior of the casing 12 and also in the interior of said tubes.

21 is a cylindrical cap secured to the head and 16 and held in place by the nuts 18 threaded on the extremities.

8 and forming an upper chamber which communicates with the open ended tubes 17 and formsya storage or collecting chamber for the heated fluid passing upwardly through'the tubes.

22 are discharge pipes-leading from the top of the cap 21.

23 is a tube secured in the central threaded hole 10 in the head 8 and extending upwardly through the top of the cap 21, said tube forming a conduit for the electric leads 24 connected to the hea ting elements.

In the operation of this device the electric current flows through the leads 24 and high resistance wires surrounding the spiral tubes thus creating a very great heat in a comparatively small space. The water, air or other fluid to be heated enters the annular and gas heaters are eliminated. Further,

' tubular-members arranged in said inner ing open. ends and communicating with the spa'cebetween said inner and outer casings,

mary heating element.

chamber formed between the casings 1 and ,within the tubes 17. and the initially heated The man. advanta es of such, an a aratus a P I tubes and electrically connected to a. suitable elect-r10 :current supply and forming with saidtubes the primary heating element 12 the temperature is raised by contact wit-lrthe exterior surface of the cham-' ber 12. A very high temperature is created fluid flows u wardly through said tubes and is thus -furt er heated The heated fluid then collects in the chamber formed in the cap 21 and circulates up through the discharge pipes 22through which it is carried to the desired apparatus, the return being through the pipes 7f The device may be used as a water heater or steam generator as desired or it may be ada oted for heating air and in either case the efiiciency is.very high. The device is of comparatively small cubic capacity but as very high temiperatures'can be obtained its efliciency is e ected by rapid circulation.

are obvious as very quick results may be ob tained and 'all the labor and many undesirable features of the ordinary forms of coal great economy of spaceis efi'ected.

. \Vhat we claim as our invention is 1. In an electric heater, a closed casing having suitableintake openings a closed casing suspendedy'ithin said outer casing, tubular members arranged in said inner casing and extending therethrough and having open ends ahd communicating with the space between said inner and. outer casings, and high resistance wires coiled around said anelectric heater,-a closed casing having suitable intake openings, a closed casing-suspended. withm said outer casing,

casing and extending therethrough and havsaid tubes having their peripheral surface formed with a spiral thread rolled therein,

a suitable insulating coatingl covering the periphery of said tubes, and. igh resistance wires wound in said spiral grooves and connected to a suitable electric current supply said wires with said tubes forming a pri- 3. -In an electric heater, a cylindrical casing, a partition wall extending across said cylindrical casing intermediate of its height .1

and dividing the interior of said cylinder into upper and lower chambers, a closed casing suspended within said lower chamber centrally thereof and haying a tubular extension projecting upwardly through said upper chamber and opening through the top of said casing, a plurality of tubular members'open at the' ends extending through said closed casing and-secured. at the ends in water tight joints, high resistance electric wires wound spirally around said tubes within said inner closed casing and connccted to suitable leads from an electric current supply extending through said central tubulanextension, intake pipes connected to said cylinder and opening into said lower chamber at'the top thereof, and discharge pipes leading from said-upper chamber.

4. In an electric heater, a casing closed at the ends and having a partition wall dividing it into upper and lower chambers, said partition-wall having a plurality of circular openings theret-hrough, an inner closed casing suspended from said partition wall within the lower chamber and having a pluralityof openings in the lower end corresponding with the openings in said partition wall, bushings of flexible material secured in said openings, tubular members open at the ends and extending through said bushings and through said inner casing and having nuts threaded at their extremity securing them in place, electric high resistance wires coiled spirally'around said tubes and connected 'to a suitable source of electric current supply, intake pipes leading to said,

VVi-tnesses: v ALFRED STILL,

PETER BARR.

I Signed at the city of Toronto, Canada,

this 30th day of October, 1912.

I WILLIE H. GIBBONS.

\Vitnesses:

E. HERON,

H. L. TRIMBLE. 

